noun a conceptual whole made up of complicated and related parts
Synonymscomposite
noun a compound described in terms of the central atom to which other atoms are bound or coordinated
Synonymscoordination compound
noun a whole structure (as a building) made up of interconnected or related structures
Synonymsbuilding complex
adjective complicated in structure; consisting of interconnected parts
SimilaranalyzableByzantinecolonialcomplicatedcompositecompounddaedalGordianinterlacingintricatelabyrinthinemultifactorialmultiplexthickening
Oppositessimple
Source: WordNet 3.1, Princeton University